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SPARKING PLUG FOR EXPLOSION MOTORS IN GENERAL.

MPUCATION LED 'AY 3; I913. 1,307,910. Patentfll June 24, 1919.

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7 5 MW; Nd N J. F- LEDANOTS.

SPARKING PLUG FpR EXPLOSON MOTORS lN GENERAL.

APPLICATION man y a. 1918.

Patented June 24, 1919 4 S'HEETSSHEET 2.

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I. F. LEDANOIS.

SPARKWG PLUG. FOR EXPLOSION MOTORS IN GENERAL.

APPLICATION FILED MAY3.19I8.

1 5307, 9 1 0. Patented June 24, 1919.

4 SHEETFSNEET I.

Fig.4.

W INVE/VFOR /04 ll'en lid/hand Leanna/Is JITORIVIY J. F. LEDANUIS SPARK'NG PLUG FOR EXPLOSION M01038 ZN GENERAL.

APPLICATION FILED MM 3. HHE.

1,307,910. Patented June 24-, 1919.

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5 point 0; moveover, a ver Jwith the metal this sparking plug, illustrated in Figs. 3 to 7 of the druwin s, the central electrode consists of a rod a mllow at its upper part and solid at the end adjacent to the ignition thin metal cup at, of the largest possible iameter, is secured to the upper part of this rod and forms an extension thereof. This cup is perforated with suitable side openings d- The central electrode a s surrounded by a casing I), made of suitable material and perforated with side 0 nings b.

In order to be a Is to take this plug to pieces, as illustrated in Figs. 3 and 4, the cap 0 is connected to the body of the plug by a nipple f which grips the insulation b at the point b. By unscrewing the nipple the insulation 6 may be easily cleaned an the impurities which may have entered the ca e and cause short circuits and misfires can readily removed from the interior of said cap a.

Moreover, the internal arrangement cap, at the ignition point 0' isin the she of a cup e smooth or'grooved longitudinal y.

This arrangement is doubly useful:

1.-At the time of the explosion, the oil or the calamiu thrown oil will enter with difficulty thrbugh a narrow opening inn chamher where the gases being compressed, form a. kindof cushion and moreover, the insulotion is by this fact, protected against the flashes of the explosion;

2. -D the suction strokehthe artial vacuum produced'i'n the cylinder wil entail oil and calamin which may still have entered the on this exit will be the more rapid the more t e who will take exthe shape of the electrode and the force 'of suction produced by the suction stroke -wi-l1 vary acoording to thd angle of the cone, the cross-section and the shape of the exit orifice which increases the Speed of the air The dismounting this par ii oi; the cap is a very important for the non detachable'sparkfor ining plugs," those which I are i stance; is it enables the interior or the cup and theacceasible ,part of the insulation as we'll as'the electrode tobecleaned.

Tho cooli of the casing I) made of insu lating'. mam-m1 may be sensibly increased by p rovid' it with wings or ribs as illustrated in Fig. 6 and by securing"this casing e of the sparking plug by means of a a coin] screw threaded sheet 9; in this way t e casing b is in more intimate contact part c and benefits, b this fact of the cooling of the latter by t e air Poo of the atmosphere.

The rod of the electrode a may be screw ,threade'd, as shown in Figs. 3 and 4, or may of the c 3. A sparking plug compr be smooth, as illustrated in Fig. 5, or screwthrended and smooth as in Fig. 7, etc.

Finally, the rod proper a might be solid, as in Fig. 8. The recess b. formed in the casing 11 plays the part of a cup he securing of the wire it leading in the current may be made either directly on the cup d, as in Fig. 7, or in a movable groove 11, as in Fig. 5, or still by a clamping rin 1 providedwith a nut k, as in Figs. 3, 7 out 8, or with a peg Z, as in Fig.4. 4

The forms, details, accessories, materials and dimensions of this ty of sparking plug may of course be varie without modifyin the scope of this invention.

C aims:

1. A sparking plug for explosion motor in genera charactc'rized by a wide, thin and perforated cooling .cup arranged at the upper part of the central electrode and by a wide and perforated cooling casing made of insulating material surrounding the said;

2. A sparking nation a. central electrode, a cooling cup constituting a, part thereof, a cooling. casing surrounding said cup, a cap surrounding the lower end of the electrode,'.and a removable cup shaped member arranged in said cap and surrounding the lower end of the electrode.

sing in combination a central electrode, a. cooling cup pro jecting outwardly therefrom, a cooling casing surrounding said cup, 1:. cap surrounding the lower end of the electrode, a, cup shaped member removably held within said cap, and means for seperably connecting the body of the spark plug with the cap.

4. A sparking plug comprising in combination a central e ing cup-projecting outwardly therefrom, and a perforated cooling cas ng surrounding sai cooling-cup.

' 5. A' sparking plug for ;explosion motors in general laterally perforated cooling cup extending outwardly from the outer of the electmdr tlb plug comprising in combi'kgi ectrode, a perforated coolcharacterized by ,an expanded part of-the central I electrode and by an expanded and laterally perforated casing of insulating material an r-' rounding the said. electrode and spaced therefrom.

The foregoing specification of my spark;

ing lu for explosion motors in general signed y me March 1918. 

